A listing of Sigads (Signals Intelligence Activity Designators, or collection stream associated with a signals intelligence station) based in Germany, collated by Der Spiegel. For around a dozen of the 150 or so historical sigads in this list, no closing date is supplied: see the Der Spiegel article Snowden-Dokumente: Hier sitzt die NSA in Deutschland, […]

﻿SIG AD LISTING
Sites
are arranged alphabetically. The open and close dates may not be totally accurate. A missing
“Opened” date indicates that the opening date is unknown. A missing “Closed...

This internal NSA post from 29 March 2004 describes the beginning of operations of the European Security Center in Darmstadt: see the Der Spiegel article Terrorverdächtige: NSA nutzte Erkenntnisse aus Deutschland-Filiale für Tötungen, 15 June 2014.